Where is the 2002 chevy trailblazer alternator fuse located?

There is no designated alternator fuse on either fuse panel in the 2002 Chevrolet TrailBlazer; instead, You'll find a fusible link between the alternator and the battery, where they are directly wired together. One advantage to this method of connection is that it's painfully obvious when the link is broken; You won't be left with guessing and testing whether or not a fuse has gone bad. More likely than a failed alternator, in the '02 Trailblazer, is an open circuit causing a component to gradually drain the battery. If Your battery capacitance is indeed good, You can run some alternator tests, but also consider that the battery is being drained while not in use. It's a bit more difficult to discover Your defective component, but the end result will likely save You a chunk of change.